I don't think so. They're never bulging, and they don't go "poof" when I open them.
I just use Scotch tape for storage, to minimize evaporation. It won't hold pressure, so you don't need to worry about that, and it comes off easily. Sealing the vent is not critical, in my opinion.
He used C and M instead of PC and PM. I'm not sure what's wrong with GY, but perhaps the wrong ink has been used there as well?? There may be something funny about black too. I don't know what the solid bars are supposed to be.
I guess I don't know what you're trying to do. What kind of printer do you have or want to get? And what kind of ink and supply system do you want to use? ???
If you're trying to find Linux drivers for a Canon printer, my answer applies.
:celebrateAardenburg is back big-time, testing some of your favorite ink in your favorite printers. And they still need support to complete the work.
http://www.aardenburg-imaging.com/portfolio/inks-and-media-testing-2017/
http://www.aardenburg-imaging.com/ :weee
PeterBJ figured it out. I refill by a vacuum method called "Freedom filling". It requires more cleanup than many other methods, and you often get artwork like this as a side effect.